<template>
  <div>
    <nav-bar>
      <div class="back" slot="left" @click="backClick">
        <img src="~assets/img/common/back.svg" alt="">
      </div>
      <div slot="center" class="title">
        <div class="title-item" 
             v-for="(item, index) in titles" 
             :class="{active: currentIndex===index}"
             @click="titleClick(index)">
             {{item}}
        </div>
      </div>
    </nav-bar>
  </div>
</template>

<script>
import NavBar from 'components/common/navbar/NavBar';

export default {
 components: {
    NavBar
  },
  data() {
    return {
      titles: ["商品", "参数", "评论", "推荐"],
      currentIndex: 0
    }
  },
  methods: {
    titleClick(index) {
      this.currentIndex = index;
      this.$emit('titleClick', index);
    },
    backClick() {
      this.$router.back();
    }
  }
}
</script>

<style scoped>
  .title {
    display: flex;
    font-size: 13px;
  }

  .title .active {
    color: var( --color-high-text);
  }

  .title-item {
    flex: 1;
  }

  .back img {
    width: 22px;
    margin-top: 11px;
  }
</style>